Q-AGNN: Quantum-Enhanced Attentive Graph Neural Network for Intrusion Detection

TL;DR

Q-AGNN introduces a quantum-enhanced graph neural network with attention mechanisms for improved intrusion detection, leveraging quantum circuits to encode relational network data and demonstrating effectiveness on real quantum hardware.

Contribution

This work presents the first quantum-enhanced graph neural network for intrusion detection, integrating quantum feature maps with attention mechanisms and validating on actual quantum hardware.

Findings

Q-AGNN achieves superior detection accuracy compared to classical methods.

The model maintains low false positive rates under noisy quantum hardware conditions.

Successful deployment of Q-AGNN on IBM quantum hardware demonstrates practical feasibility.

Abstract

With the rapid growth of interconnected devices, accurately detecting malicious activities in network traffic has become increasingly challenging. Most existing deep learning-based intrusion detection systems treat network flows as independent instances, thereby failing to exploit the relational dependencies inherent in network communications. To address this limitation, we propose Q-AGNN, a Quantum-Enhanced Attentive Graph Neural Network for intrusion detection, where network flows are modeled as nodes and edges represent similarity relationships. Q-AGNN leverages parameterized quantum circuits (PQCs) to encode multi-hop neighborhood information into a high-dimensional latent space, inducing a bounded quantum feature map that implements a second-order polynomial graph filter in a quantum-induced Hilbert space. An attention mechanism is subsequently applied to adaptively weight the quantum-enhanced embeddings, allowing the model to focus on the most influential nodes contributing to anomalous behavior. Extensive experiments conducted on four benchmark intrusion detection datasets demonstrate that Q-AGNN achieves competitive or superior detection performance compared to state-of-the-art graph-based methods, while consistently maintaining low false positive rates under hardware-calibrated noise conditions. Moreover, we also executed the Q-AGNN framework on actual IBM quantum hardware to demonstrate the practical operability of the proposed pipeline under real NISQ conditions. These results highlight the effectiveness of integrating quantum-enhanced representations with attention mechanisms for graph-based intrusion detection and underscore the potential of hybrid quantum-classical learning frameworks in cybersecurity applications.